Deviations From Optimal Alignment in TKA: Is There a Biomechanical Difference Between Femoral or Tibial Component Alignment?

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• 作者：Bernardo Innocenti ; PhD^a ; ; Johan Bellemans ; MD ; PhD^b ; Fabio Catani ; MD^c
• 关键词：TKA ; neutral mechanical alignment ; varus alignment ; valgus alignment ; tibial stress ; collateral ligament strain
• 刊名：The Journal of Arthroplasty
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：31
• 期：1
• 页码：295-301
• 全文大小：1569 K

文摘

Restoration of neutral mechanical alignment is one of the prerequisites for long-term TKA survival. This study aimed to investigate the effect of deviations from neutral alignment on bone and implant stress and on ligament strain. Using a previously validated finite element model, a neutrally aligned TKA model was compared to 3 different varus and valgus configurations induced by tibial or by femoral component only and by both component simultaneously. Each model underwent a 2500 N vertical load simulating the peak walking force. Varus and valgus alignment increased polyethylene and bone stress, and altered ligament strains, as compared to the neutral aligned model. Changes in alignment of the tibial component were always associated with more detrimental effects compared to the one of the femoral component.